I don't know that she should do it. She's a one-hit wonder with an all-time classic. Another book will do little to help her and could hurt her legacy if it is just mediocre. Sounds like a great opportunity for a publisher and promoter, but for her? She's not even in good mental health to decide.

If she had had feedback from constructive critics who approved of the move that's another story. There's nothing in the article to indicate this either way.